[INFO] updating cached repository https://github.com/rubytogether/kirby
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9495d6a4fa5c64bdd42172396b089b56096e0c18
[INFO] testing rubytogether/kirby against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Frubytogether%2Fkirby" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rubytogether/kirby on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/rubytogether/kirby
[INFO] disabled cargo feature 'default-run' from git repo https://github.com/rubytogether/kirby
[INFO] finished tweaking git repo https://github.com/rubytogether/kirby
[INFO] tweaked toml for git repo https://github.com/rubytogether/kirby written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/rubytogether/kirby already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 0f13a6e5b3910bcc985383a99abe8ea10b16d3c05cd05f7968aa0e4957e56ced
[INFO] running `"docker" "start" "-a" "0f13a6e5b3910bcc985383a99abe8ea10b16d3c05cd05f7968aa0e4957e56ced"`
[INFO] [stderr]    Compiling ryu v0.2.5
[INFO] [stderr]    Compiling reexport-proc-macro v1.0.5
[INFO] [stderr]    Compiling array-macro v1.0.2
[INFO] [stderr]    Compiling argparse v0.2.2
[INFO] [stderr]    Compiling backtrace-sys v0.1.24
[INFO] [stderr]    Compiling ring v0.13.2
[INFO] [stderr]    Compiling tower-service v0.1.0
[INFO] [stderr]    Compiling libz-sys v1.0.20
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling nom v4.0.0
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling bytes v0.4.10
[INFO] [stderr]    Compiling serde_bytes v0.10.4
[INFO] [stderr]    Compiling hashbrown v0.1.6
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling chrono v0.4.6
[INFO] [stderr]    Compiling serde_derive_internals v0.23.1
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.1.6/src/lib.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     feature(alloc, alloc_layout_extra, allocator_api, ptr_offset_from, test, core_intrinsics)
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling regex v1.0.4
[INFO] [stderr]    Compiling backtrace-parser v0.1.0
[INFO] [stderr]    Compiling serde_schema v0.1.0 (https://github.com/srijs/rust-serde-schema#da935d38)
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `hashbrown`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "0f13a6e5b3910bcc985383a99abe8ea10b16d3c05cd05f7968aa0e4957e56ced"`
[INFO] running `"docker" "rm" "-f" "0f13a6e5b3910bcc985383a99abe8ea10b16d3c05cd05f7968aa0e4957e56ced"`
[INFO] [stdout] 0f13a6e5b3910bcc985383a99abe8ea10b16d3c05cd05f7968aa0e4957e56ced